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ISO 4280:1977

Current Revision

Cryolite, natural and artificial, and aluminium fluoride for industrial use -- Determination of sulphate content -- Barium sulphate gravimetric method

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Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.


SDO ISO: International Organization for Standardization
Document Number ISO 4280
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47/SC 7
Publish Date Document Id Type View
Not Available ISO 4280:1977 Revision